The bottom line you do not know this guy. You don’t know if he had or didn’t have covid and what stress he had it even his living conditions or his life style. You know nothing about him. He is a stranger. Enduring abuse and name calling from a total stranger as well as repeatedly calling a total stranger who refuses to answer to you is totally unnecessary. Your willingness to accept abuse and mistreatment needs to be your focus, not he and his life. He isn’t important. You act as you are in a relationship with him so you have to figure him out, you have never met and aren’t in a relationship so figuring him out is an exercise in futility. You don’t know him. Understanding strangers is a waste of time. Try to understand yourself. I recommend therapy to help with that